Resilience to decoherence of the macroscopic quantum superpositions generated by universally covariant optimal quantum cloning

Year: 2010

Authors: Spagnolo N., Sciarrino F., De Martini F.

Autors Affiliation: Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy; Consorzio Interuniv Sci Fis Materia, I-00185 Rome, Italy; Ist Nazl Ottica, I-50125 Florence, Italy; Accademia Nazl Lincei, I-00165 Rome, Italy.

Abstract: We show that the quantum states generated by universal optimal quantum cloning of a single photon represent a universal set of quantum superpositions resilient to decoherence. We adopt the Bures distance as a tool to investigate the persistence of quantum coherence of these quantum states. According to this analysis, the process of universal cloning realizes a class of quantum superpositions that exhibits a covariance property in lossy configuration over the complete set of polarization states in the Bloch sphere.

Journal/Review: PHYSICAL REVIEW A

Volume: 82 (3)      Pages from: 32325-1  to: 32325-7

More Information: We acknowledge support by the Futuro in Ricerca Project HYTEQ, and Progetto d’Ateneo of Sapienza Universita di Roma.
KeyWords: State; Cloning; Optimization; Quantum optics; Spheres
DOI: 10.1103/PhysRevA.82.032325

Citations: 4
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